From ...
From: Erik Naggum <erik@naggum.no>
Subject: Re: concatenated-stream - which component is being read from?
Date: 2000/03/29
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* Sam Steingold <sds@gnu.org>
| Is there a way to figure out which component of a concatenated stream is
| being read from?

  from the definition of concatenated-stream-streams:

Returns a list of input streams that constitute the ordered set of streams
the concatenated-stream still has to read from, starting with the current
one it is reading from. The list may be empty if no more streams remain to
be read.

#:Erik